钩体病首选抗生素为_______。

钩端螺旋体由_______、_______、_______组成。

钩体病黄疸出血型的主要死亡原因为_________。

钩体病根据临床表现的主要特点可分为______、______、______、______、______。

钩体病病理损害的基本特点为________________________。

国内外的研究发现，钩体_______的差别与致病力有关。

钩体病眼部后发症主要表现为________、________、_______。

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

   水痘自发病前_____天直至结痂为止，有很强的传染性，本病为_____或_____传播。